Portion of a port plug for a respiratory mask



FIG. 1 is a perspective view of a portion of a port plug for arespiratory mask showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

Where included, broken lines showing environment or structure are forillustrative purposes only and form no part of the claimed design. Whereincluded, dotted lines represent the border between claimed andunclaimed subject matter and form no part of the claimed design.

The ornamental design for a portion of a port plug for a respiratorymask, as shown and described.